Create a new Module in Magento
In the architecture magento we know that all of Magento functions are modules in other words Magento is a set of modules perform different tasks. In this article I will guide you to create a new module is full of key components called "Hello World".
Note - All of the demo module is written in the local folder because magento will surely make new version and if so, the code in each local directory update my code has not been affected.